[linux-2.6-block.git] / drivers / gpu / drm / nouveau / nvkm / subdev / timer / base.c

/*
 * Copyright 2012 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */
#include "priv.h"

u64
nvkm_timer_read(struct nvkm_timer *tmr)
{
	return tmr->func->read(tmr);
}

void
nvkm_timer_alarm_trigger(struct nvkm_timer *tmr)
{
	struct nvkm_alarm *alarm, *atemp;
	unsigned long flags;
	LIST_HEAD(exec);

	/* move any due alarms off the pending list */
	spin_lock_irqsave(&tmr->lock, flags);
	list_for_each_entry_safe(alarm, atemp, &tmr->alarms, head) {
		if (alarm->timestamp <= nvkm_timer_read(tmr))
			list_move_tail(&alarm->head, &exec);
	}

	/* reschedule interrupt for next alarm time */
	if (!list_empty(&tmr->alarms)) {
		alarm = list_first_entry(&tmr->alarms, typeof(*alarm), head);
		tmr->func->alarm_init(tmr, alarm->timestamp);
	} else {
		tmr->func->alarm_fini(tmr);
	}
	spin_unlock_irqrestore(&tmr->lock, flags);

	/* execute any pending alarm handlers */
	list_for_each_entry_safe(alarm, atemp, &exec, head) {
		list_del_init(&alarm->head);
		alarm->func(alarm);
	}
}

void
nvkm_timer_alarm(struct nvkm_timer *tmr, u32 nsec, struct nvkm_alarm *alarm)
{
	struct nvkm_alarm *list;
	unsigned long flags;

	alarm->timestamp = nvkm_timer_read(tmr) + nsec;

	/* append new alarm to list, in soonest-alarm-first order */
	spin_lock_irqsave(&tmr->lock, flags);
	if (!nsec) {
		if (!list_empty(&alarm->head))
			list_del(&alarm->head);
	} else {
		list_for_each_entry(list, &tmr->alarms, head) {
			if (list->timestamp > alarm->timestamp)
				break;
		}
		list_add_tail(&alarm->head, &list->head);
	}
	spin_unlock_irqrestore(&tmr->lock, flags);

	/* process pending alarms */
	nvkm_timer_alarm_trigger(tmr);
}

void
nvkm_timer_alarm_cancel(struct nvkm_timer *tmr, struct nvkm_alarm *alarm)
{
	unsigned long flags;
	spin_lock_irqsave(&tmr->lock, flags);
	list_del_init(&alarm->head);
	spin_unlock_irqrestore(&tmr->lock, flags);
}

static void
nvkm_timer_intr(struct nvkm_subdev *subdev)
{
	struct nvkm_timer *tmr = nvkm_timer(subdev);
	tmr->func->intr(tmr);
}

static int
nvkm_timer_fini(struct nvkm_subdev *subdev, bool suspend)
{
	struct nvkm_timer *tmr = nvkm_timer(subdev);
	tmr->func->alarm_fini(tmr);
	return 0;
}

static int
nvkm_timer_init(struct nvkm_subdev *subdev)
{
	struct nvkm_timer *tmr = nvkm_timer(subdev);
	if (tmr->func->init)
		tmr->func->init(tmr);
	tmr->func->time(tmr, ktime_to_ns(ktime_get()));
	nvkm_timer_alarm_trigger(tmr);
	return 0;
}

static void *
nvkm_timer_dtor(struct nvkm_subdev *subdev)
{
	return nvkm_timer(subdev);
}

static const struct nvkm_subdev_func
nvkm_timer = {
	.dtor = nvkm_timer_dtor,
	.init = nvkm_timer_init,
	.fini = nvkm_timer_fini,
	.intr = nvkm_timer_intr,
};

int
nvkm_timer_new_(const struct nvkm_timer_func *func, struct nvkm_device *device,
		int index, struct nvkm_timer **ptmr)
{
	struct nvkm_timer *tmr;

	if (!(tmr = *ptmr = kzalloc(sizeof(*tmr), GFP_KERNEL)))
		return -ENOMEM;

	nvkm_subdev_ctor(&nvkm_timer, device, index, &tmr->subdev);
	tmr->func = func;
	INIT_LIST_HEAD(&tmr->alarms);
	spin_lock_init(&tmr->lock);
	return 0;
}
Commit	Line	Data
5a5c7432 BS	1	/*
	2	* Copyright 2012 Red Hat Inc.
	3	*
	4	* Permission is hereby granted, free of charge, to any person obtaining a
	5	* copy of this software and associated documentation files (the "Software"),
	6	* to deal in the Software without restriction, including without limitation
	7	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	8	* and/or sell copies of the Software, and to permit persons to whom the
	9	* Software is furnished to do so, subject to the following conditions:
	10	*
	11	* The above copyright notice and this permission notice shall be included in
	12	* all copies or substantial portions of the Software.
	13	*
	14	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	15	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	17	* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
	18	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	19	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	20	* OTHER DEALINGS IN THE SOFTWARE.
	21	*
	22	* Authors: Ben Skeggs
	23	*/
31649ecf BS	24	#include "priv.h"
	25
	26	u64
	27	nvkm_timer_read(struct nvkm_timer *tmr)
	28	{
	29	return tmr->func->read(tmr);
	30	}
	31
	32	void
	33	nvkm_timer_alarm_trigger(struct nvkm_timer *tmr)
	34	{
	35	struct nvkm_alarm alarm, atemp;
	36	unsigned long flags;
	37	LIST_HEAD(exec);
	38
	39	/* move any due alarms off the pending list */
	40	spin_lock_irqsave(&tmr->lock, flags);
	41	list_for_each_entry_safe(alarm, atemp, &tmr->alarms, head) {
	42	if (alarm->timestamp <= nvkm_timer_read(tmr))
	43	list_move_tail(&alarm->head, &exec);
	44	}
	45
	46	/* reschedule interrupt for next alarm time */
	47	if (!list_empty(&tmr->alarms)) {
	48	alarm = list_first_entry(&tmr->alarms, typeof(*alarm), head);
	49	tmr->func->alarm_init(tmr, alarm->timestamp);
	50	} else {
	51	tmr->func->alarm_fini(tmr);
	52	}
	53	spin_unlock_irqrestore(&tmr->lock, flags);
	54
	55	/* execute any pending alarm handlers */
	56	list_for_each_entry_safe(alarm, atemp, &exec, head) {
	57	list_del_init(&alarm->head);
	58	alarm->func(alarm);
	59	}
	60	}
5a5c7432	61
5a5c7432	62	void
31649ecf	63	nvkm_timer_alarm(struct nvkm_timer tmr, u32 nsec, struct nvkm_alarm alarm)
5a5c7432	64	{
31649ecf BS	65	struct nvkm_alarm *list;
	66	unsigned long flags;
	67
	68	alarm->timestamp = nvkm_timer_read(tmr) + nsec;
	69
	70	/* append new alarm to list, in soonest-alarm-first order */
	71	spin_lock_irqsave(&tmr->lock, flags);
	72	if (!nsec) {
	73	if (!list_empty(&alarm->head))
	74	list_del(&alarm->head);
	75	} else {
	76	list_for_each_entry(list, &tmr->alarms, head) {
	77	if (list->timestamp > alarm->timestamp)
	78	break;
	79	}
	80	list_add_tail(&alarm->head, &list->head);
	81	}
	82	spin_unlock_irqrestore(&tmr->lock, flags);
	83
	84	/* process pending alarms */
	85	nvkm_timer_alarm_trigger(tmr);
5a5c7432	86	}
b925a75d MP	87
b925a75d MP	88	void
31649ecf BS	89	nvkm_timer_alarm_cancel(struct nvkm_timer tmr, struct nvkm_alarm alarm)
	90	{
	91	unsigned long flags;
	92	spin_lock_irqsave(&tmr->lock, flags);
	93	list_del_init(&alarm->head);
	94	spin_unlock_irqrestore(&tmr->lock, flags);
	95	}
	96
	97	static void
	98	nvkm_timer_intr(struct nvkm_subdev *subdev)
b925a75d	99	{
31649ecf BS	100	struct nvkm_timer *tmr = nvkm_timer(subdev);
	101	tmr->func->intr(tmr);
	102	}
	103
	104	static int
	105	nvkm_timer_fini(struct nvkm_subdev *subdev, bool suspend)
	106	{
	107	struct nvkm_timer *tmr = nvkm_timer(subdev);
	108	tmr->func->alarm_fini(tmr);
	109	return 0;
	110	}
	111
	112	static int
	113	nvkm_timer_init(struct nvkm_subdev *subdev)
	114	{
	115	struct nvkm_timer *tmr = nvkm_timer(subdev);
	116	if (tmr->func->init)
	117	tmr->func->init(tmr);
	118	tmr->func->time(tmr, ktime_to_ns(ktime_get()));
	119	nvkm_timer_alarm_trigger(tmr);
	120	return 0;
	121	}
	122
	123	static void *
	124	nvkm_timer_dtor(struct nvkm_subdev *subdev)
	125	{
	126	return nvkm_timer(subdev);
	127	}
	128
	129	static const struct nvkm_subdev_func
	130	nvkm_timer = {
	131	.dtor = nvkm_timer_dtor,
	132	.init = nvkm_timer_init,
	133	.fini = nvkm_timer_fini,
	134	.intr = nvkm_timer_intr,
	135	};
	136
	137	int
	138	nvkm_timer_new_(const struct nvkm_timer_func func, struct nvkm_device device,
	139	int index, struct nvkm_timer **ptmr)
	140	{
	141	struct nvkm_timer *tmr;
	142
	143	if (!(tmr = ptmr = kzalloc(sizeof(tmr), GFP_KERNEL)))
	144	return -ENOMEM;
	145
56d06fa2	146	nvkm_subdev_ctor(&nvkm_timer, device, index, &tmr->subdev);
31649ecf BS	147	tmr->func = func;
	148	INIT_LIST_HEAD(&tmr->alarms);
	149	spin_lock_init(&tmr->lock);
	150	return 0;
b925a75d	151	}